Tosoh Quartz, Inc.
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Tosoh Quartz, Inc.
We are Tosoh Quartz, Inc. (TQI), the world's leading manufacturer of quartz glassware for the semiconductor industry. With locations in Portland, OR and Durham, UK, we have been dedicated to uncompromising quality and service since our founding in 1957. Our purpose is to transform Earth’s most useful natural substance into products that benefit humanity.